What we're hearing: Zuckerberg spent nearly an hour taking questions on a conference call Wednesday. Among the highlights:

Most of its 2 billion users could have had the public parts of their profiles scraped before Facebook turned off some search options on Wednesday.

So far Facebook has seen no "meaningful" defections from users or advertisers.

Zuckerberg admitted making some big mistakes but still believes he is the right person to lead the company. And no one has been fired because, he said, "I started this place, I run it, I’m responsible for what happens here."

Ahead of the press call, Facebook revealed more people than previously thought — as many as 87 million — may have had their information accessed by Cambridge Analytica (something that firm denies, per TechCrunch). Facebook also detailed 9 new steps it's taking to better protect users' information.

Meanwhile, Sandberg is scheduled to do several interviews Thursday, including sit-downs with PBS NewsHour, Bloomberg TV, the Today Show, NPR and Fox News. Zuckerberg will take a break from the press and focus on preparing for his congressional testimony.

The bottom line: By rolling out privacy updates and interviews with apologetic executives, the company is trying to give Zuckerberg material he can use to save himself when he faces fired-up lawmakers. But the new revelations about the scale of Facebook’s privacy scandals are giving critics on Capitol Hill more to work with, too.

Between the lines: Zuckerberg's challenge is to avoid the screw-ups of other corporate executives called to account on Capitol Hill. That includes coming across as defiant, as Bill Gates did defending Microsoft in the heat of his firm's '90s antitrust battle, or tone deaf, like the auto executives who flew private to D.C. seeking a bailout.

Background: The company points to a recent survey of a thousand parents that found 72% want kids to have their own tablet or smartphones and three quarters don't want to hover. At the same time, parents want to know what their kids are up to and to set limits.

Amazon tries to ease security for AWS users

Amazon's AWS Secrets Manager. Photo: Amazon

Meanwhile, another part of Amazon is trying to make it easier for business customers to do the right thing when it comes to security.

What's new: At a conference in San Francisco Wednesday, Amazon announced AWS Secrets Manager, a new tool designed to keep people from storing passwords and other sensitive information in plain documents.

"People will do that sometimes because it's convenient," Amazon's Ariel Kelman told Axios. With the new tool, Amazon hopes to make it just as easy to do things in a secure way.

Why it matters: As Kelman puts it, the biggest problem in computer security isn't the technology, it's the people using it.

More details on the YouTube shooting

A more detailed, if still not yet complete, picture of Tuesday's shooting at YouTube's headquarters has started to emerge. Police confirmed that they believe Nasim Najafi Aghdam, the suspect in the YouTube shooting, was motivated by her anger at the video site for restricting her videos.

The details, per San Bruno police:

Aghdam was at a Bay Area gun range the morning of the shooting.

Aghdam apparently entered YouTube through a parking lot. She apparently was able to get from there to a campus courtyard, but not into the YouTube building itself.

They have secured her vehicle, and agencies are serving 2 search warrants at homes in Southern California.

NBCUniversal announced this morning a new advertising metric called CFlight, which will measure all advertising impressions across every NBCU viewing platform — whether those ads were consumed live, on-demand, on linear TV or digital platforms.